Windmill ship: Difference between revisions
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== Types == |
== Types == |
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Several types can be made; these include windmill-only ships |
Several types can be made; these include windmill-only ships,<ref >[http://gcaptain.com/maritime/blog/ocean-kites-top-10-green-ship-designs/ Windmill-only ship image]</ref> windmill/rotorsail ships<ref >[http://books.google.com/books?id=eAAAAAAAMBAJ&pg=PA70&lpg=PA70&dq=rotor+sail&source=bl&ots=xSUYlMKaNc&sig=9GDzOSzqbYErnJySv1__h4TVxbc&hl=nl&ei=B5WrSqmQB9fajQe9qdj3Bw&sa=X&oi=book_result&ct=result&resnum=7#v=onepage&q=rotor%20sail&f=false Image of windmill/rotor sail hybrid ship]</ref> as well as hybrid ships which store wind power from the windmill when the ship does not need to be propelled. To reduce the energy required to propel the boat, windmill ships are often equipped with low-friction hull designs, such as [[multihull]]s, or they are [[hydrofoil]]s. Boats without low-friction hulls or hydrofoils can be equipped with windmills, but often the force generated by the windmills alone is not sufficient to propel the craft. In this case, the windmills only provide [[sail assist|supplemental force]] to conventional sails or other propulsion systems. |
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At present, research is still going on and the best types of bladed rotors still needs to be determined. For example, high horizontal axis wind mills are proven to make the ship less stable. Therefore, [[ |
At present, research is still going on and the best types of bladed rotors still needs to be determined. For example, high horizontal axis wind mills are proven to make the ship less stable. Therefore, [[Vertical axis wind turbine|vertical axis wind mills]] (eg [[Savonius wind turbine|Savonius turbines]]) are sometimes preferred.<ref >[http://books.google.be/books?id=DuMDAAAAMBAJ&pg=PA124&lpg=PA124&dq=rotor+sailing&source=bl&ots=U-Benorbn2&sig=pv7QYM8cWUOaX7ewZZiiJxWU7GY&hl=nl&ei=ElqrSrDiOZCZjAem_4TiBw&sa=X&oi=book_result&ct=result&resnum=3#v=onepage&q=rotor%20sailing&f=false Rotor sails schematic and model boat construction]</ref> Also, the wind mill needs to be highly durable as marine environments tend to degrade windmills more quickly than what is common on land.<ref>[http://sciencelinks.jp/j-east/article/200117/000020011701A0501883.php Windmill ship research]</ref><ref >[http://www.bluenergy-ag.net/English/tech_wind.html Vertical axis windmill on windmill boat]</ref> |
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==Current ships== |
==Current ships== |
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Few windmill ships have been built to date; these include |
Few windmill ships have been built to date; these include:<ref>[https://secure.seabreeze.com.au/forums/topic.asp?TOPIC_ID=49631 Current windmill ships]</ref> |
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* Jim Bates' Te whaka |
* Jim Bates' Te whaka |
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* Lindsay Olen's Thrippence |
* Lindsay Olen's Thrippence |
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* Peter Worsley's windmill-driven boat |
* Peter Worsley's windmill-driven boat |
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* Jim Wilkinson's Revelation 2<ref>http://news.bbc.co.uk/2/hi/uk_news/1507825.stm</ref> |
* Jim Wilkinson's Revelation 2<ref>{{cite web|url=http://news.bbc.co.uk/2/hi/uk_news/1507825.stm |title=UK | Design puts boat in a spin |publisher=BBC News |date=2001-08-24 |accessdate=2010-06-16}}</ref> |
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==References== |
==References== |
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Revision as of 21:08, 16 June 2010
hydrogen_hybrid_ship.jpg){kind=link}
A windmill ship, wind energy conversion system ship or wind energy harvester ship propels itself by use of a windmill connected to the propeller. Windmill ships should not be confused with rotor ships, as they do not rely on the Magnus effect for propulsion. They use direct wind power[1] mechanically transferred (not electrically like with windturbines), allowing the force to be transferred to the propeller without conversion losses. In windmill hybrid boats, electrical conversion of the power is nonetheless done when the energy can not be used immediately and needs to be stored.
Points of sail
Due to the fact that a windmill can rotate 360°, a windmill ship can sail in any direction.[2][3]
Types
Several types can be made; these include windmill-only ships,[4] windmill/rotorsail ships[5] as well as hybrid ships which store wind power from the windmill when the ship does not need to be propelled. To reduce the energy required to propel the boat, windmill ships are often equipped with low-friction hull designs, such as multihulls, or they are hydrofoils. Boats without low-friction hulls or hydrofoils can be equipped with windmills, but often the force generated by the windmills alone is not sufficient to propel the craft. In this case, the windmills only provide supplemental force to conventional sails or other propulsion systems.
At present, research is still going on and the best types of bladed rotors still needs to be determined. For example, high horizontal axis wind mills are proven to make the ship less stable. Therefore, vertical axis wind mills (eg Savonius turbines) are sometimes preferred.[6] Also, the wind mill needs to be highly durable as marine environments tend to degrade windmills more quickly than what is common on land.[7][8]
Current ships
Few windmill ships have been built to date; these include:[9]
- Jim Bates' Te whaka
- Lindsay Olen's Thrippence
- Peter Worsley's windmill-driven boat
- Jim Wilkinson's Revelation 2[10]
References
- ^ Windmill sailboats
- ^ Windmill powered boats
- ^ Windmill ship video demonstrating sail points and boat specifics
- ^ Windmill-only ship image
- ^ Image of windmill/rotor sail hybrid ship
- ^ Rotor sails schematic and model boat construction
- ^ Windmill ship research
- ^ Vertical axis windmill on windmill boat
- ^ Current windmill ships
- ^ "UK | Design puts boat in a spin". BBC News. 2001-08-24. Retrieved 2010-06-16.